Governing mechanism for fluid-pressure motors



C. R. WALLER.

GOVERNING MECHANISM FOR FLUID PRESSURE MOTORS.

APPLICATION FILED APR.6|19|6- 1,311,931 Patented Aug. 5, 1919.

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PATENT OFFICE CAR menm'wnn er TRENroiv, N W JERSEY, ASSIGNOR TO DE LAVAL STEAM TURBINE,COMPANY,OE,1\TEWYORK, 1v. Y.,,A CORPORATION or NEW JERSEY.

GovEnn INe MEcnhivIsM Eon FLfiI DQI RESSURE MOTORS.

To all whom/it may concern: 1

r bines, and comprises a pilot-valve controlled' 'nism from theflui'dso operating the governor fvalve' and to make the entire mecha nism very simple,-compactand free from P my invention will .appear hereafter.

Beitknown that I, CARE RICHA D WAL- LER, a citizen of the United States of America, and a resident of Trenton, in the county of Mercer and State of New Jersey, have iinvented certain new and useful Improvements in Governing Mechanlsm for Flu1d-' Pressure Motors, of which the following is a specification. '1' 1 1 My invention relates to pressure-operated governing means for elastic fluid motors,

particularly steam and compressed air turgovernor valve wherein the motive fluid for operatlngjt'he pilot-valve-controlled motor of the maingovern'or valve is an elastic fluid; preferably the same elastic fluid which drives the main motoror turbine; Other features of my inventionwill be pointed out hereafter; 7

The objects of 'my invention are todispense with the usual highpressure oil-supply system commonly provided for operating the governor valves of pilot-valve governing systems ;-to operate the governor valve by elastic fluid, preferably the elasticfluid which operates the motor;, to'cause the? elasticfluid under pressure which operates thegovernor valve to also do work'inf the motor; to avoid condensation In the governor valve mechaliability to derangement. 'Other 'objects of I will now proceed to describe my invention-with reference "to'the accompanying, drawing 1n wh ch aport on of'an"elast1c fluid turbine, a pilot-valve controlled governor valve therefor, and a centrifugal overnor controlling the pilot valve ares own, some of the parts being shown in elevation and others in central. vertical section, the drawing being"diagrammatic rather than illustrative of actual construction.

At the present time, the practice as to governing a steam turbine of 500 kw. or larger is to use an oil-operated valve gear controlling the governor valve or valves, the pressure against the oil piston of this valve gear being varied as required by means of a pilot valve actuated by a speed governor, usually a centrifugal governor. In the case of valve gear of such type, it is speeiifi cation of Letters fatent.

Patented Aug. 5,1919.

ap ucanenmed April's, 1916. Serial No. 89,373.

1 necessary to furnish means, such for eX ample as a pump, which Wlll malntain the OllllSBCl to operate such valve ear under' a considerable pressure, usually between 80 and 40 pounds. For lubrication, the turbine is customarily provided with another oil pressure system, maintained at from 3 to 5 pounds pressure. The ordinary method of governing at present in use, therefore, involves two oil pressure systems, with attendan't complications. By the invention herein described I dispense with the, higher pres sure of these oil systems, substituting there fora much simpler elastic fluid pressure system, the elastic fluid being drawn, pref erably, from the supply line by which steam or other working fluid under pressure is supplied to the turbine.

In the drawing, 1 designates the nozzle ring of an elastic fluid turbine, 2 the main high pressure steam chest of that turbine, receiving its steam supply through the main governor valve 4. This valve 4 is of the double balanced puppet type, comprising valve disks 13 mounted on a valve spindle 5, to which spindle is connected piston 6, movable in a cylinder 14. A spring 7 is located in said cylinder 14, above the piston 6, and tends to press that piston and valve disks 13 downward. Steam orotherworking fluid under pressure is supplied from the'inlet side of the valve 4, through a pilot valve 8, to the portion 9 ofthe cylinder 14:

beneath the piston 6. The pilot valve 8 is also of the double balanced puppet type, comprising valve disks 15 mounted upon a spindle 15 connected by a rocker lever 11 to aspeed governor 12, preferably ofthe centrifugal type.

A conduit 10 leads from the chamber 9 of cylinder 6; and preferably leads fromthe pipe connection connecting valve 8 Y with cylinder chamber 9. This conduit 10 is connected toany suitable sourc'eof lower pressure, but preferably is connected to an auxiliary steam chest 3 of the turbine, which steam chest 3 is provided with means, such as one or more nozzles 16, whereby the steam so supplied to auxiliary steam chest 3 may do useful work; such nozzle or nozzles 16 being so proportioned that any slight alteration of the position of valve disks 15 will immediately cause change of pressure in steam chest 3, conduit 10 and chamber 9, 

